Very interesting technical photos and info on a vintage aircraft. I asked around and it may show a Convair and a commercial airliner. Maybe. If you know better, please send a note. There is a 3-ring binder containing over 40 photo images and 10 blueprints, all about 8x10 inches. They date around 1946 (WW2 era). There are numerous handwritten notes on many of the photos and it is surely some type of quality control inspection. Please take a look at the photos we provided. Amazing!